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Li Moses Man-Lung,Kwok Jojo Yan-Yan,Chung Kwong-Yin,Cheung Kin-Wing,Chiu Kwok-Hing,Chau Wai-Wang,Ho Kevin Ki Wai 대한슬관절학회 2020 대한슬관절학회지 Vol.32 No.-
Total knee arthroplasty (TKA) is associated with significant perioperative blood loss and postoperative allogenic blood transfusion. Tranexamic acid (TXA) reversibly blocks lysine binding sites on plasminogen molecules and inhibits plasmin formation. Comparisons of the efficacy and safety of intra-articular and intravenous TXA in primary TKA have not previously been reported.A prospective randomized trial was conducted in 150 patients who underwent TKA, and these patients were randomized into three groups. Patients in Group A were injected by intra-articular TXA according to body weight (20 mg/kg). Patients in Group B received a standard dose of intra-articular TXA (2000 mg), and those in Group C were infused with TXA according to body weight (20 mg/kg) before tourniquet deflation and again 3 h later. Baseline characteristics and data collected at blood transfusion were compared. Differences among four time points (baseline, day 0, day 2, and day 5) were carried out using ANOVA. The hemoglobin levels at postoperative day 5 were 10.6 g/dL for Group A, 10.6 g/dL for Group B, and 10.7 g/dL for Group C. The drain output was 399 ml for Group A, 314 ml for Group B, and 305 ml for Group C ( p = 0.03). Group C had significantly less drain output than Group A after post hoc comparisons ( p = 0.05), whereas no significant difference was observed between Group A and B ( p = 0.09) or between Group B and C. The weight-adjusted dose of TXA administered intravenously significantly reduced the drain output but not the total blood loss when compared with the weight-adjusted dose of TXA administered intra-articularly. No significant difference was observed in the other parameters among the three groups. The Joint CUHK-NTEC CREC, CRE-2013.644-T . Registered 1 March 2014.
Development and commissioning of the UNIST electron beam ion trap
Park SungNam,Shin Bokkyun,Cosgun Emre,Han JeHwan,Chung Moses 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.84 No.5
An electron beam ion trap (EBIT) creates and confnes highly charged ions (HCIs). To maximize the movement of the EBIT towards and away from the accelerator beamlines, we adopted permanent magnets, thereby reducing the size and maintenance costs associated with the EBIT. A magnetic feld of 0.84 T at the trap center provided a trap capacity of approximately 107 charges. By sweeping the electron beam energy from 2.4 keV to 3.3 keV at an electron beam current of 10 mA, the silicon drift detector successfully measured the KLL lines of the HCI states of argon and confrmed the presence of up to He-like argon ions. Before measuring the highly charged irons for astrophysics purposes, we conducted preliminary experiments to connect the EBIT with the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) hard X-ray beamline. In this study, we present the initial operation of the compact EBIT at an XFEL facility, demonstrating its X-ray fuorescence measurement capability.